docs: def set_subpixel_order(self, subpixel_order):
          """Changes the :ref:`SUBPIXEL_ORDER` for the font options object.
           The subpixel order specifies the order of color elements
           within each pixel on the display device
           when rendering with an antialiasing mode of
           :obj:`SUBPIXEL <ANTIALIAS_SUBPIXEL>`.
  
          """
          cairo.cairo_font_options_set_subpixel_order(
              self._pointer, subpixel_order)
          self._check_status()